Muffler with relief valve



L. L. HAAS March 10, l93 1 MUFFLER WITH RELIEF VALVE Filed Sept.

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Patented Mar. 10, 1931 UNITED STATES Lucian L. sans, or Burr-arc, nnw YOR PATENT o ic x, nssrenon "r BUFFALO- rnsssansrnm.

00., oases-ram, NEW YORK mun. wrrn nnnmr vnnvn Application fled September 1 1928. Serial No. 308,475.

a mufiier provided with a plurality of sets or series of mufiling chambers arranged in succession and having a bypass controlledby a valve by means of which'one or more series of chambers can be by-passed bythe gases; also to provides. mufiler of this kind with a chamber which forms a part of a bypass when the cut-out valve is open and which acts as a buffer or cushionin chamber to increase the mufliing efl'ect o the mufller or silencer when the cut-out valve is closed; also to improve the construction of mu'lilers pip silencers in'other respects hereinafter spece I In the accompanying drawings: v

Figs. 1 and 2 are fragmentary sectional views of a mufiler embodying this invention,

Fig. 1 showing the inlet portion of the mufiier and Fig. 2 showing the exhaust portion of the mufiler. I

Figs. 3, 4 and 5 are transverse sectional elevations respectively, on lines 33, 44 and 5-5 of Fig.2.

Fig. 6 is a fragmentary sectional view on line66 of Fig.

My invention may be employed in connection with a mufiler of any desired form or construction in which a plurality of mufliing chambers are provided, and the particular mufiier shown in the drawings is merely illustrated to show one embodiment of my invention, and it will be obvious, that-mufllers of other constructions may be used in con-v nection with my invention if desired.

The mufiler may be provided with an external shell A of any suitable or desired construction, that shown being made of three layers of material. 7

The shell, however, may be made of a single layer if desired. The shell is provided at the inlet end thereof with a head 10 havthe muflier.

ing a central opening through which the inlet'pipe '11 extends, the ipe' being secured 3 to the head 10. A second cad 12 is" arranged at a distance from the inlet end iofthe muiiler and is preferably formed with a SQIIBSOf shoulders, the outer one' of'which is secured to the inner face of'the outer shell A of the mufiler. Another head or baflie M is arran ed adjacent to the op ositelend of the mu er, (see Fi 2) 'and t e two' heads or baflles are forms to support the opposite ends of a series of tubular members or 'shells' VB. and C, the shell" 0 'engagingshouldered portions'17 and 18 respectively of thefheads 12 and 14 and the shell B being supported on shoulders 20-and 21 respective y of the "heads or baflles 12 and 14. The innershell C is pm vided intermediateof the ends thereofjwith a transverse partition 24 which separates this -shell into two chambers'arrange'd lengthwise of the shell. An annular h'ead'25is arranged between the shells or tubes 3" andfC' and divides the space between these shells into two chambers. 1

In the particular construction shown'the inner tube 0 is of substantially circular cross section and the tube 13 is of tne elongated or elliptical cross section; The head 14 is ar-.

ran ed at a distance from the discharge end of t e muflierandforms with an end wall or head 26, a chamber 27, the head 26 being provided with an exhaust or discharge tube or pipe 28. Through the chamber 27 exte nds a tube 30 which in the particular construction shown is bent or inclined and which connects the central portion of the head '14 with a side of a transverse partition wall 31 arranged at a-slight distance from the discharge end of the muflier. The artition wall 31 .is also provided with a" ischarge passage formed by a. relatively .heavy short length of tubing 33' in'which a cut-out valve 1 34 is arranged, the'valve 34 in the particular construction shown being mounted" on a pivot or post 35 pivoted in the tube 33 and extend A ing at one end through the outer shell Aof At its outer end the valve 35 is provided with an arm 36 havin I any suitable connection 37 at its outer en by means of which the valve may be turned nto an open or closed position. Any other type of valve may beprovided in lace ofthe valve shown.

The inlet end of t e tube or shell C is provided. adjacent to the partition 24 with a V seriesv of holes or discharge openings 40 through which gases entering this tube through the inlet pipe llof the muflier may discharge into the chamber or space between the tubes or shells B and C. The shell B is provided adjacent to the head or bafile 12 with a series of discharge openings or holes 41 through which gases may enter into. the chamber or space between the tubes or shells B and A of the mufiier, the head compelling the gases discharged from the openings to' pass lengthwise of the space between thetubes B and C, and thence through discharge openings 41mm the outer chamber 7 'or space 42'.- This space terminates in the '20 head 14 which is provided with a series of openings 44 at. the opposite .sides'thereof through which gases may pass fromtheouter chamber 42 intothe chamber 27.

' (lon'seguently when the cut-out valve 34 isjopene the outer chamber 42 to the 'mufiler may discharge through the apertures44 into the chamber 27 and thencethrough the tube 33 to the discharge'pipe 28. Consequently the so products of combustion will pass only through the first series or group of muflling chambers arranged between the inlet of the muflier 'and the partitions 24' and '25, and the chambers 42 and 27 tothe discharge of the mufller. However, when the valve 34 is closed the chamber 27 has no discharge openings excepting openings 46 which are not of sufficient size to carry 011' all the gases entering the chamber 27 through the apertures 44, which are formed in the head 14 and the greater ortion of the gases are then forced to pass rom the chamber 42 through aseries of openings 45 in the shell B.

Through these openings the gases enter the pace between the shells B and C and between t ep'artiti'on 25 and the head 14. The openings 46 establishcommunication between the chamber 27 and'the ace between the tubes B and G, and some 0 {the gases enterin the equalizingchamber 27 may pass throu the apertures 46 into the space between'the shells B and C, which gases must reverse their. di-

rection of flow within the chamber 27 in order to pass through the apertures 46. The eater portion of the gases, however, pass t rough the apertures 45 in the shell B and do not enter thechamber 27 when the valve 34 is closed. In order to pass to the atmosphere from'the space betweenthe shells B and C and heads 25 and 14,'the gases must pass through apertures 47 into the shell C and from the lnterior of this shell through the tube 30 into the dischargespace between the transverse heads 31 and 26 at the discharge 66 end of the newer and thence throu h the itwill'be noted that the gas from discharge ipe 28. This discharge space between the eads 31 and 26 serves mainly to conduct the gases, whether discharged through the pipe 30 or the valve pipe 33 to the discharge pipe 28 of the mufiier. This space however also has a certain mufliing efchamber 27 and compress the gases contained therein, and during the interval between ex plosions these compressed gases can discharge from the chamber 27 through the second series of-mufliin chambers and thence to the atmosphere. this manner the chamber 27 serves to produce a more uniform flow ofgas through the discharge chamber and consequently a better mufiiing or silencing is produced without increasing the back pressure of the gases in the muffler.

When the cut-out valve is opened, the gases introduced into the muflier are not dischar (1 directly to the atmosphere as has hereto ore commonly been done, but are passed through a series or group of mufiiing chambers before they are discharged to the atmosphere. Consequently the noise of the exhaust is greatly reduced without materially increasing the back ressure-of the exhaust gases.

I c aimas my invention:

' 1. A- muflier having a series of muming chambers throughwhich all gases enterin said mufiier' must pass, a second series 0 muflling chambers through which ses may pass after passing throu h said rst series of chambers, a chamber ocated at the discharge end of said muflier and communicating with said two series of muflling chambers, and a valve in said chamber for discharging gases from said chamber without forcing the gases to pass through said second series of mufiling chambers. 4

2. A muflier having a series of mufliing chambers through which all gas entering said mufiler must pass, a second series of mufiiing chambers through which gas may pass after passingv through said first series of chambers, a combined by-pass and equalizing chamber which communicates with said first series of mufi'ling chambers, and a valve in 'said by-pass and equalizing chamber which,

when open, permits gases to discharge from said chamber to the atmosphere and which, when closed, causes gases to pass from said first series of mufliing chambers to said second series and enables gases to be compressed in said equalizing chamber during the exhaust and to discharge therefrom to said second series of mufliing chambers when pres-,, 1,

\ chargcdidlrectly to the atmosphere without passing. through said second series of mufsure due to exhaust is reduced.

3. A muflier having a first series of muffllng chambers arranged one within another,

a second series of mufiiing chambers also ar- I .medlate and an inner shell, a transverse parranged one within another and through which gases may pass after passing through said first series of chambers, and an equaliz ing chamber into which some of the gases may pass after having passed through said first series of mufliing chambers and in which the gases may be alternately compressed and discharged to said second series of muflling chambers to equalize the flow of gas through said second series of chambers.

4. A mufiler having a first series of mufiiing chambers arrangedone within another, a second series of mufiiing chambers also arranged one within another and through which gases may pass after passing through said first series of chambers, an equalizing chamber into which some of the gases may pass after having passed through said first series of mufiling chambers and in which the gases may be alternately compressed and discharged to said second series of muflling chambers to equalize the flow of gas through said second series of chambers, and a dis charge passage leading from said second series of mufiiing chambers to the atmosphere ggd passing through said equalizing chamr. 5. A mufller having a first series of muflling chambers arranged one within another, a second series of mufiling chambers also arranged one within another and through which gases 7 may pass after passing through said first series of chambers, an equalizing chamber into which some of the gases may pass after having passed through said first series of muffling chambers and in which the gases may be alternately compressed and discharged to said second series of muffling chambers to equalize the flow of gas through said second series of chambers, and a valve in said equalizing chamber by means of which gas from said equalizing chamber may be discharged to the atmosphere.

6. A muflier having a first series of muflling chambers arranged one within another, a second series of muflling chambers also arranged one within another and through which gases may pass after passing through said first series of chambers, an equalizing chamber into which some of the gases may pass after having passed through first series of muifiing chambers and in which the gases may be alternately compressed and discharged to said second series of muflling chambers to equalize the flow of gas through said second series of chambers, a discharge passage leading from said second series of muffling chambers to the atmosphere and passing through said equalizing chamber, and. valve in said equalizing chamber-through which gases from. the equalizing chamber maybe. disflingchambersr v v v .7 A mufller including an outer, an intertition arranged'inthe inner shellanddividing. the sameinto two chambers, a transverse tween said shells into two chambers, means 'for admitting gases to. one of the chambers of the inner shell,;apertu-res through which gases. are discharged from said chamber to one of the chambers between the intermediate and inner shells, apertures in said intermediate shell for discharging the gases to an,

outer chamber arranged between the intermediate and outer shell, an equalizing chamber which communicates with said outer chamber, a valve in said equalizing chamber for discharging gases from said e ualizing:

chamber to the atmosphere when sai valve is opened, and apertures for conducting gases from said outer chamber through the other chambers formed by said intermediate and outer shells when said valve is closed. 8. A mufller including a group of mufliing chambers arranged one within'another and through which. gases pass from the inlet of the mufiler, a second group of mufllin chambers arranged one within another an beyond said first mentioned group of chambers, an outer chamber surrounding said two groups of mufiiingchambers and through which the gases pass from said first group to said second group, an equalizing chamber arranged beyond said second oup of muffling chambers connecting with said outer chamber, a valve in saidequalizing chamber for discharging gases from said equalizing chamber to the atmosphere without causing I said gases to pass through said second group of muflling chambers, said valve when closed causing gases to flow from said outer chamber through said second group of muflling chambers and means for discharging gases from said second group of muflling chambers to the atmosphere.

9,. A muflier having aseries of mufiiing chambers through which all gases entering said mufiler must pass, a second series of mufiling chambers through which gases may pass after passing through said first series of chambers, a chamber located at the discharge end of said muffler and communicating withsaid two series of mufiling chambers, a valve in said chamber for discharging gases from said chamber to the atmosphere without forcing the gases to pass through said' second series of mufliing chambers, and a passage extending from said second series of muffling chambers through said chamber to the charge end of sa1d mufiler.

10. A muifler having a series of muflling I chambers through which all gases enterin said muflier must pass, a second series 0 m'uflimg chambers through whlch ases may pass after passmg through sald rst serles of chambers, a chamber commumcatmg wlth sa1d two serles of chambers and whlch has gas recelvmg and dlschargln the same slde thereof to cause the dlrectlon of flow of the gases to be reversed, and a discharge valve in said chamber which may be opened to discharge gases from the mufller without causing them to flowthrough said I second series of chambers.

LUOIEN 'L. HAAS.

openings in 

